CN104632171B - Complete set of equipments and method under Multilateral Wells staged fracturing completion interval of well - Google Patents
Complete set of equipments and method under Multilateral Wells staged fracturing completion interval of well Download PDFInfo
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- CN104632171B CN104632171B CN201510060994.0A CN201510060994A CN104632171B CN 104632171 B CN104632171 B CN 104632171B CN 201510060994 A CN201510060994 A CN 201510060994A CN 104632171 B CN104632171 B CN 104632171B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 61
- 238000005553 drilling Methods 0.000 claims abstract description 55
- 210000002445 nipple Anatomy 0.000 claims abstract description 6
- 238000003780 insertion Methods 0.000 claims description 32
- 230000037431 insertion Effects 0.000 claims description 32
- 238000011084 recovery Methods 0.000 claims description 18
- 238000012546 transfer Methods 0.000 claims description 17
- 238000002627 tracheal intubation Methods 0.000 claims description 12
- 238000003801 milling Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 235000015927 pasta Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides complete set of equipments and method under a kind of Multilateral Wells staged fracturing completion interval of well, the equipment includes positioning tool string or branch well fracturing tool string；Positioning tool string includes the drilling rod, orientation pipe nipple and positioner connected with can be removably mounted from top to bottom；Positioner includes the lowering system and sealing base connected with can be removably mounted from top to bottom；Lowering system includes connecting rod and the tapered expansion plug set from top to bottom；The bottom of sealing base is fixedly connected with plug, and sealing base includes the sealing and holding part set from top to bottom, and tapered expansion is plugged in the inner chamber of holding part；Holding part, plug and tapered expansion plug surround push chamber, and push chamber promotes tapered expansion plug to move crush seal portion upwards and radially expanded；Branch well fracturing tool string includes drilling rod, releasing tool and the branch borehole pressure break completion tubular column connected with can be removably mounted successively from top to bottom.The device and method of the present invention can improve the security of pressure break by fracturing string string feeding in place.
Description
Technical field
Well technical field is drilled the present invention relates to oil and gas industry, more particularly to a kind of Multilateral Wells that are used for are segmented pressure
Complete set of equipments and method under the completion interval of well split.
Background technology
Multilateral well is to get out several pit shafts on the different depth in a main hole to be used to exploit different depth oil reservoir
Well.The technology, which can increase, rushes down pasta product, improves oil well output, oil reservoir development cost is reduced comprehensively.In low hole, hypotonic, low
In pressure and Heterogeneous Oil And Gas Reservoirs, staged fracturing is carried out in branch well hole, well yield can be effectively improved.
It is general in routine techniques to use pressure break tubing string to carry out pressure break again after fracturing string string is sent directly into place, due to
The lighter in weight of tubing string, rigidity is small, often situation not in place is sent in extended horizontal well, such as in actual job
It is still not in place by sending into repeatedly, direct pressure break at position just often is being sent into, fracturing effect is being influenceed, it is impossible to significantly improve individual well
Yield.
The content of the invention
To solve above-mentioned technical problem, the present invention proposes complete set of equipments and side under a kind of Multilateral Wells staged fracturing completion interval of well
Complete set of equipments is reliably positioned in the wellbore using positioner under method, Multilateral Wells staged fracturing completion interval of well, so as to fracturing string
String can send into the security for improving pressure break in place.
Complete set of equipments under a kind of Multilateral Wells staged fracturing completion interval of well of the present invention, including positioning tool string or branch well pressure break
Tool string；
The positioning tool string includes the drilling rod, orientation pipe nipple and positioner connected with can be removably mounted successively from top to bottom；
The positioner includes the lowering system being sequentially connected from top to bottom and for the sealing base with the cooperation of the inwall of sleeve pipe, institute
Lowering system is stated to be connected with can be removably mounted with the sealing base；
The lowering system includes connecting rod and the tapered expansion plug set gradually from top to bottom；The sealing base is hollow
Cylinder, the bottom of the sealing base be fixedly connected one be used for insulate plug；The sealing base includes setting successively from top to bottom
The sealing and holding part that can radially expand put, the internal diameter of the holding part are more than the internal diameter of the sealing, the cone
Shape is swollen to be plugged in the inner chamber of the holding part and positioned at the top of the plug；The inwall of the holding part, the plug and
The lower surface of the tapered expansion plug surrounds push chamber, and the upward motion of the tapered expansion plug is promoted by the pressure of the push chamber
The sealing is extruded to radially expand；
The branch well fracturing tool string include connect with can be removably mounted successively from top to bottom the drilling rod, releasing tool and
Branch borehole pressure break completion tubular column.
Further, the upper releasing tool that the releasing tool includes connecting with can be removably mounted successively from top to bottom is given up with
Instrument；
The upper releasing tool includes the upper releasing running tool connected with can be removably mounted successively from top to bottom and above given up back
Patch cylinder, it is described on the give up upper end of tieback insertion tube there is upwardly opening inserting groove, the upper releasing running tool can be plugged
Ground is placed in the inserting groove.
Further, the branch well fracturing tool string also includes the pressure break tubing string being sequentially connected from top to bottom and returned
Jacket pipes, the tieback intubation can be inserted in the inserting groove.
As a kind of enforceable mode, the lower releasing tool with it is described on give up tieback insertion tube by hydraulic releasing or
Pitching is given up separation, the upper releasing running tool with it is described on tieback insertion tube of giving up given up and separate by back-off.
Further, the upper surface of the sealing base is to set keyway on guiding surface, the side wall of the sealing base,
The side wall of the keyway has otch, and the side wall of the keyway intersects in the incision with the guiding surface；
Under the Multilateral Wells staged fracturing completion interval of well complete set of equipments also include reclaim whipstock, the recovery whipstock it is upper
End sets windowing inclined-plane, and the lower end of the recovery whipstock is stretched into the hollow and connected with can be removably mounted with the sealing base
Connect；The positioning key that can be engaged with the keyway is set on the side wall for reclaiming whipstock, the positioning key is cut by described
Mouth is slipped into the keyway.
The stop pin that can radially stretch is set as a kind of enforceable mode, on the side wall of the recovery whipstock,
Pin-and-hole is set on the side wall of the hollow, and the stop pin is extended radially and is engaged with the pin-and-hole.
Further, the otch of the keyway is located at the lower end of the guiding surface.
Further, the lowering system also includes locating part, and the locating part is sleeved on the outside of the connecting rod,
The lower surface of the locating part is the spacing inclined-plane being engaged with the guiding surface.
As a kind of enforceable mode, the plug is sealed on the lower surface of the hollow.
Further, the area of section of the tapered expansion plug is gradually reduced from top to bottom.
The present invention also proposes a kind of Multilateral Wells staged fracturing completion method, using above-mentioned Multilateral Wells staged fracturing completion interval of well
Lower complete set of equipments, the Multilateral Wells staged fracturing completion method comprises the following steps：
After S10, casing cementing, main borehole is bored, main borehole staged fracturing is completed；
S20, positioning tool string transfers to predetermined well depth, and being suppressed in well head makes the sealing base and described sleeve pipe of positioner
Inwall be brought into close contact, plug insulates the main borehole；Above carry the drilling rod, the lowering system of the positioner with it is described close
Seal base-separation；
S30, transfers gyroscope, measures the true bearing angle of the guiding surface of the sealing base, calculates the reality side
Phase difference between parallactic angle and predetermined design orientation, reclaims the gyroscope；
S40, whipstock is reclaimed in well head adjustment, and the recovery whipstock is transferred to the sealing base by the drilling rod,
The recovery whipstock is locked with the sealing base；The drilling rod is above carried, the recovery whipstock is given up with the drilling rod；
S50, opens a window at the windowing inclined-plane of the recovery whipstock, sidetracking branch well；Transfer branch well fracturing tool string
Into the branch well, branch borehole fracturing work is completed, acts the releasing tool in described sleeve pipe；
S60, the drilling rod transfers casing section mill, and the casing section mill reclaims the recovery whipstock；The drilling rod transfers junk mill
Plug described in milling, connects the main borehole and the branch well.
Further, in the S50, step S510, institute are included in decentralization branch well fracturing tool string to the branch well
State upper releasing tool, lower releasing tool and branch borehole pressure break completion that drilling rod decentralization is connected in which can be removably mounted successively from top to bottom
Tubing string, the upper releasing running tool and tieback of above giving up that the upper releasing tool includes connecting with can be removably mounted successively from top to bottom is inserted
Cylinder；After the drilling rod decentralization in place, the lower releasing tool is located in the branch well；
Above carry the drilling rod, the upper releasing running tool with it is described on tieback insertion tube of giving up give up；Pressure break tubing string
Lower end connects back to jacket pipes, and the tieback intubation inserts tieback insertion tube of being given up on described, realizes the tieback of the pressure break tubing string；
The pressure break tubing string is docked with the branch borehole pressure break completion tubular column, forms airtight passage, carries out branch borehole pressure
Split operation；
Acting releasing tool in described sleeve pipe includes step S520, is suppressed in well head, the lower releasing tool with
Tieback insertion tube of being given up on described is given up, and is acted the pressure break tubing string, the tieback and is intubated and is given up on described tieback insertion tube.
The present invention is compared to the beneficial effect of prior art：Under Multilateral Wells staged fracturing completion interval of well complete set of equipments and
In method, positioner provides to reclaim the lowered position of whipstock, the directional drilling of the windowing position and branch well of branch well
Reliable positioning datum.Complete set of equipments can ensure to transfer to positioner using drilling rod under Multilateral Wells staged fracturing completion interval of well
Predetermined well depth, advantageously ensures that the position of sidetracking branch well is accurate.Using drilling rod tripping in branch borehole pressure break completion tubular column, phase
Than in the tripping in mode of routine techniques, the present invention can guarantee that tubing string decentralization in place, improve the security of fracturing work, improve single
Well production.
Brief description of the drawings
Fig. 1 is the structural representation of the main borehole got out after casing cementing；
Fig. 2 is the structural representation that main borehole staged fracturing completion tubular column is transferred in main borehole；
Fig. 3 positions the structural representation of tool string to be transferred in sleeve pipe using drilling rod；
Fig. 4 makes lowering system be given up with sealing base the structural representation separated above to carry drilling rod；
Fig. 5 is the structural representation on drilling rod decentralization gyroscope to sealing base；
Fig. 6 is recovery whipstock and the exploded perspective view of sealing base；
Fig. 7 is that drilling rod transfers the structural representation reclaimed on whipstock to sealing base；
Fig. 8 is the structural representation that drilling rod is separated with reclaiming whipstock to give up；
Fig. 9 is the structural representation of the branch well that sidetracking goes out at the windowing inclined-plane for reclaiming whipstock；
Figure 10 is that drilling rod transfers branch well fracturing tool string to the structural representation in branch well；
Figure 11 is that upper releasing running tool is given up the structural representation separated with tieback insertion tube of above giving up；
The structural representation that Figure 12 is connected for the tieback intubation of pressure break tubing string lower end with tieback insertion tube of above giving up；
Figure 13 gives up the structural representation separated for tieback insertion tube of above giving up with lower releasing tool；
Figure 14 is that drilling rod transfers structural representation of the casing section mill into sleeve pipe；
The structural representation of Multilateral Wells after Figure 15 is reclaimed for recovery whipstock by casing section mill；
Figure 16 is that drilling rod transfers structural representation of the junk mill into sleeve pipe；
The structural representation that Figure 17 connects for main borehole after plug milling with branch well.
Reference：
1- sleeve pipes；2- main boreholes；3- main borehole staged fracturing completion tubular columns；
4- sealing bases；41- sealings；42- holding parts；43- guiding surfaces；44- keyways；45- pin-and-holes；
5- lowering systems；51- connecting rods；52- tapered expansion plugs；The spacing inclined-planes of 53-；
6- drilling rods；7- orients pipe nipple；8- plugs；9- gyroscopes；
10- reclaims whipstock；101- windowings inclined-plane；102- positioning keys；
11- branch wells；12- branch borehole pressure break completion tubular columns；Releasing tool under 13-；
The upper releasing tools of 14-；The upper releasing running tools of 141-；Given up on 142- tieback insertion tube；
15- tiebacks are intubated；16- pressure break tubing strings；17- casing section mills；18- junk mills.
Embodiment
Below in conjunction with accompanying drawing, the technical characteristic above-mentioned and other to the present invention and advantage are clearly and completely described,
Obviously, described embodiment is only the section Example of the present invention, rather than whole embodiments.
Refer to shown in Fig. 1 and Fig. 2, after sleeve pipe 1 is cemented the well, bore main borehole 2, transfer main borehole staged fracturing completion tubular column 3,
Main borehole staged fracturing operation is carried out using common process, after the completion of main borehole staged fracturing operation, main borehole staged fracturing is complete
Well casing post 3 stays in shaft bottom.
Complete set of equipments includes positioning tool string or branch well pressure break under a kind of Multilateral Wells staged fracturing completion interval of well of the present invention
Tool string.As shown in figure 3, positioning tool string is including the drilling rod 6 connected with can be removably mounted successively from top to bottom, orientation pipe nipple 7 and determines
Position device.It can ensure positioner transferring to predetermined well depth using drilling rod 6, advantageously ensure that the position of sidetracking branch well is accurate
Really.Positioner includes the lowering system 5 and sealing base 4 being sequentially connected from top to bottom, lowering system 5 and the energy of sealing base 4
Removably connect.Sealing base 4 is hollow, and sealing base 4 is used to coordinate with the inwall of sleeve pipe 1, and the bottom of sealing base 4 is consolidated
Surely connection one is used for the plug 8 insulated.
Refer to shown in Fig. 4, lowering system 5 includes connecting rod 51 and the tapered expansion plug 52 set gradually from top to bottom.It is close
Envelope pedestal 4 includes the sealing 41 that can be radially expanded and holding part 42 set gradually from top to bottom, the internal diameter of holding part 42
More than the internal diameter of sealing 41.Tapered expansion plug 52 is placed in the inner chamber of holding part 42 and positioned at the top of plug 8, holding part 42
The lower surface of inwall, plug 8 and tapered expansion plug 52 surrounds push chamber, makes the pressure rise of push chamber, promote tapered expansion plug 52 to
Upper motion, the crush seal portion 41 of tapered expansion plug 52 is radially expanded, and is coordinated so that sealing base 4 is sealed with sleeve pipe 1.
Further, as shown in figure 4, lowering system 5 also includes locating part, locating part is sleeved on the outer of connecting rod 51
Portion, the lower surface of locating part is the spacing inclined-plane 53 being engaged with guiding surface 43.The insertion sealing of connecting rod 51 of lowering system 5
In the holding part 42 of pedestal 4, spacing inclined-plane 53 cooperates with guiding surface 43, makes whole positioner in the cylinder of rule
Shape, so that impact resistance is stronger.
As a kind of enforceable mode, plug 8 is sealed on the lower surface of hollow；During plug 8 can also be arranged on
The inside of empty cylinder.
Further, the area of section of tapered expansion plug 52 is gradually reduced from top to bottom.
Further, refer to shown in Fig. 6 and Fig. 7, the upper surface of sealing base 4 (i.e. hollow) is guiding surface 43,
Keyway 44 is set on the side wall of sealing base 4, and the side wall of keyway 44 has otch, and the side wall of keyway 44 is oblique with being oriented in incision
Intersect in face 43.Complete set of equipments also includes reclaiming whipstock 10 under Multilateral Wells staged fracturing completion interval of well, reclaims the upper end of whipstock 10
Windowing inclined-plane 101 is set, and the lower end for reclaiming whipstock 10 is stretched into hollow and is connected with can be removably mounted with sealing base 4；Reclaim
The positioning key 102 that can be engaged with keyway 44 is set on the side wall of whipstock 10, and positioning key 102 slips into keyway 44 by otch
It is interior.
As a kind of enforceable mode, the stop pin that sets and can radially stretch on the side wall of whipstock 10 is reclaimed, in
Pin-and-hole 45 is set on the side wall of empty cylinder, and stop pin is extended radially and is engaged with pin-and-hole 45, makes recovery whipstock 10 and sealing
Pedestal 4 can effectively locking, it is to avoid depart from.Further, the otch of keyway 44 is located at the lower end of guiding surface 43.
Refer to shown in Figure 10, under Multilateral Wells staged fracturing completion interval of well the branch well fracturing tool string of complete set of equipments include from
Drilling rod 6, releasing tool and branch borehole pressure break completion tubular column 12 that top to bottm is connected in which can be removably mounted successively.Further, lose
Hand-held tool includes the upper releasing tool 14 and lower releasing tool 13 connected with can be removably mounted successively from top to bottom.Refer to Figure 11 institutes
Show, the upper releasing running tool 141 and tieback of above giving up that upper releasing tool 14 includes connecting with can be removably mounted successively from top to bottom are inserted
Cylinder 142, the upper end for tieback insertion tube 142 of above giving up has upwardly opening inserting groove, and upper releasing running tool 141 is put in which can plug
In inserting groove.
Further, refer to shown in Figure 12, branch well fracturing tool string also includes the pressure break being sequentially connected from top to bottom
Tubing string 16 and tieback intubation 15, tieback intubation 15 can be inserted in inserting groove.Upper releasing running tool 141 is extracted after inserting groove,
Tieback intubation 15 inserts inserting groove, carries out branch borehole fracturing work.
As a kind of enforceable mode, lower releasing tool 13 and tieback insertion tube 142 of above giving up pass through hydraulic releasing or throwing
Ball is given up separation, and upper releasing running tool 141 is given up by back-off with tieback insertion tube 142 of above giving up and separated.At the place of sleeve pipe 1
Use back-off to give up in main hole safer, different modes of giving up is used on whole tubing string string, the peace of operation can be also improved
Quan Xing.
The present invention a kind of Multilateral Wells staged fracturing completion method, using under above-mentioned Multilateral Wells staged fracturing completion interval of well into
Complete equipment, comprises the following steps：
S10, as depicted in figs. 1 and 2, after sleeve pipe 1 is cemented the well, bores main borehole 2, main after the completion of main borehole staged fracturing operation
Borehole pressure break completion tubular column 3 stays in shaft bottom；
S20, as shown in Figure 3 and Figure 4, transfers to predetermined well depth, being suppressed in well head makes positioner by positioning tool string
The inwall of sealing base 4 and sleeve pipe 1 is brought into close contact, the packing main borehole 2 of plug 8；Above carry drilling rod 6, the lowering system 5 of positioner
Separated with sealing base 4；Sealing base 4 is lowered position, the windowing position of branch well 11 and the branch well for reclaiming whipstock 10
11 directional drilling provides positioning datum；
S30, is referred to shown in Fig. 5, is transferred in gyroscope 9, the present embodiment in the decentralization of gyroscope 9 to orientation pipe nipple 7, measurement
The true bearing angle of the guiding surface 43 of sealing base 4, calculates the phase difference between true bearing angle and predetermined design orientation,
Reclaim gyroscope 9；
S40, is referred to shown in Fig. 7 and Fig. 8, is reclaimed whipstock 10 according to the adjusting offset measured in well head, is adjusted back
The method for receiving whipstock 10 is the ordinary skill in the art, be will not be repeated here；Drilling rod 6 transfers to sealing by whipstock 10 is reclaimed
Pedestal 4, reclaims whipstock 10 and is locked with sealing base 4；Drilling rod 6 is above carried, whipstock 10 is reclaimed and is given up with drilling rod 6；
S50, is referred to shown in Fig. 9, is opened a window at the windowing inclined-plane 101 for reclaiming whipstock 10, sidetracking branch well 11；As schemed
Shown in 10, in decentralization branch well fracturing tool string to branch well 11, branch borehole fracturing work is completed, Figure 13 institutes are referred to
Show, act the releasing tool in sleeve pipe 1；
S60, is referred to shown in Figure 14 and Figure 15, the decentralization of drilling rod 6 casing section mill 17 supporting with reclaiming whipstock 10, casing section mill
17 reclaim whipstock 10；Refer to shown in Figure 16, the decentralization milling plug 8 of junk mill 18 of drilling rod 6 is referred to shown in Figure 17, ground
After the completion of milling, main borehole 2 connects to form overall structure with branch well 11.
Further, in S50, step S510 is included in decentralization branch well fracturing tool string to branch well 11, drilling rod 6 is transferred
Upper releasing tool 14, lower releasing tool 13 and the branch borehole pressure break completion tubular column connected with can be removably mounted successively from top to bottom
12.Refer to shown in Figure 11, upper releasing tool 14 includes the upper releasing running tool 141 connected with can be removably mounted successively from top to bottom
Above give up tieback insertion tube 142；After drilling rod 6 is transferred in place, lower releasing tool 13 is located in branch well 11；Drilling rod 6 is above carried, is above lost
Hand running tool 141 is given up with tieback insertion tube 142 of above giving up.In the present embodiment, upper releasing running tool 141 and tieback of above giving up
Insertion tube 142 is given up separation by back-off, and reversion drilling rod 6 can be achieved to give up.Using the tripping in branch borehole pressure break completion of drilling rod 6
Tubing string 12, compared to pressure break oil pipe tripping in mode is used, the present invention can guarantee that tubing string decentralization in place, improve the peace of fracturing work
Quan Xing.
Refer to shown in Figure 12, the lower end of pressure break tubing string 16 is connected back to gives up in jacket pipes 15, the insertion of tieback intubation 15
Tieback insertion tube 142, realizes the tieback of pressure break tubing string 16；12 pairs of pressure break tubing string 16 and branch borehole pressure break completion tubular column
Connect, form airtight passage, carry out branch borehole fracturing work.Acting the releasing tool in sleeve pipe 1 includes step S520,
Refer to shown in Figure 13, suppressed in well head, lower releasing tool 13 is given up with tieback insertion tube 142 of above giving up, act pressure break tubing string
16th, tieback intubation 15 and on give up tieback insertion tube 142.
It is different from conventional pressure break, in the Multilateral Wells staged fracturing completion method of the present invention, before tripping in pressure break tubing string 16,
Need that branch borehole pressure break completion tubular column 12 is lowered into branch well 11 by side windowing, pressure break is suppressed in tripping in afterwards in place
Complete, in addition it is also necessary to branch borehole pressure break completion tubular column 12 is separated with pressure break tubing string 16 by releasing tool, makes branch well
Staged fracturing completion tubular column 12 is remained entirely in branch well hole 11, and pressure break tubing string 16 goes out.The recovery that will be left in sleeve pipe 1 is oblique
Reclaimed to device 10, without fracturing string string or pressure break oil pipe string in sleeve pipe 1, the need for linking up main branch well so as to next step, so that
Complete Multilateral Wells staged fracturing technique.Accordingly, it would be desirable to ensure that fracturing string string must be lowered into branch well 11 completely, if branch
12 tripping in of completion tubular column of borehole pressure break are not in place, and main borehole 2 and branch well 11 can be caused to link up process and be obstructed, cause branch
Well construction fails.
In the present invention, successfully branch borehole pressure break completion tubular column 12 is sent to using the larger drilling rod 6 of weight
Position, improves the security of pressure break, it is ensured that fracturing effect, improves well yield.Simultaneously as when drilling rod 6 can not bear pressure break
High pressure, is given up in drilling rod 6 after tripping in by upper releasing running tool 141 with tieback insertion tube 142 of above giving up, tripping in pressure break oil pipe string
Docked with the branch borehole pressure break completion tubular column 12 of bottom, form airtight passage, complete fracturing work.
Particular embodiments described above, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, it will be appreciated that the foregoing is only the specific embodiment of the present invention, the protection being not intended to limit the present invention
Scope.Particularly point out, to those skilled in the art, within the spirit and principles of the invention, that is done any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (6)
1. a kind of complete set of equipments under Multilateral Wells staged fracturing completion interval of well, it is characterised in that the Multilateral Wells staged fracturing completion interval of well
Lower complete set of equipments includes positioning tool string or branch well fracturing tool string；
The positioning tool string includes the drilling rod, orientation pipe nipple and positioner connected with can be removably mounted successively from top to bottom；It is described
Positioner includes the lowering system that is sequentially connected from top to bottom and for the sealing base with the cooperation of the inwall of sleeve pipe, it is described under
Place system is connected in which can be removably mounted with the sealing base；
The lowering system includes connecting rod and the tapered expansion plug set gradually from top to bottom；The sealing base is hollow,
The bottom of the sealing base be fixedly connected one be used for insulate plug；The sealing base includes what is set gradually from top to bottom
The sealing and holding part that can be radially expanded, the internal diameter of the holding part are more than the internal diameter of the sealing, the tapered expansion
Plug in the inner chamber of the holding part and positioned at the top of the plug；The inwall of the holding part, the plug and described
The lower surface of tapered expansion plug surrounds push chamber, and the upward motion for promoting the tapered expansion plug by the pressure of the push chamber is extruded
The sealing is radially expanded；Wherein, the upper surface of the sealing base is on guiding surface, the side wall of the sealing base
Keyway is set, and the side wall of the keyway has otch, and the side wall of the keyway intersects in the incision with the guiding surface；
Complete set of equipments also includes reclaiming whipstock under the Multilateral Wells staged fracturing completion interval of well, and the upper end of the recovery whipstock is set
Windowing inclined-plane is put, the lower end of the recovery whipstock is stretched into the hollow and is connected with can be removably mounted with the sealing base；
The positioning key that can be engaged with the keyway is set on the side wall for reclaiming whipstock, the positioning key is slided by the otch
Enter in the keyway；The stop pin that can radially stretch, the side wall of the hollow are set on the side wall for reclaiming whipstock
Upper setting pin-and-hole, the stop pin is extended radially and is engaged with the pin-and-hole；
The branch well fracturing tool string includes the drilling rod, releasing tool and the Zhi Jing connected with can be removably mounted successively from top to bottom
Eye staged fracturing completion tubular column；
The releasing tool includes the upper releasing tool and lower releasing tool connected with can be removably mounted successively from top to bottom；Lost on described
Hand-held tool includes the upper releasing running tool that connects with can be removably mounted successively from top to bottom and tieback insertion tube of above giving up, it is described on give up
The upper end of tieback insertion tube has upwardly opening inserting groove, and the upper releasing running tool is placed in the inserting groove with plugging
In；The branch well fracturing tool string also includes the pressure break tubing string being sequentially connected from top to bottom and tieback intubation, the tieback
Intubation can be inserted in the inserting groove；The lower releasing tool with it is described on tieback insertion tube of giving up lost by hydraulic releasing or pitching
Hand is separated, the upper releasing running tool with it is described on tieback insertion tube of giving up given up and separate by back-off；
Wherein, the sealing base is to reclaim the lowered position of whipstock, the windowing position of branch well and the Directional Drilling of branch well
Enter to provide positioning datum.
2. complete set of equipments under Multilateral Wells staged fracturing completion interval of well according to claim 1, it is characterised in that the keyway
Otch is located at the lower end of the guiding surface.
3. complete set of equipments under Multilateral Wells staged fracturing completion interval of well according to claim 1, it is characterised in that the decentralization system
System also includes locating part, and the locating part is sleeved on the outside of the connecting rod, and the lower surface of the locating part is to be led with described
The spacing inclined-plane being engaged to inclined-plane.
4. complete set of equipments under Multilateral Wells staged fracturing completion interval of well according to claim 1, it is characterised in that the plug envelope
Cover on the lower surface in the hollow.
5. complete set of equipments under Multilateral Wells staged fracturing completion interval of well according to claim 1, it is characterised in that the tapered expansion
The area of section of plug is gradually reduced from top to bottom.
6. a kind of Multilateral Wells staged fracturing completion method, it is characterised in that using point as described in any one of claim 1 to 5
Complete set of equipments under branch well staged fracturing completion interval of well, the Multilateral Wells staged fracturing completion method comprises the following steps：
After S10, casing cementing, main borehole is bored, main borehole staged fracturing is completed；
S20, positioning tool string transfers to predetermined well depth, and being suppressed in well head makes in the sealing base and described sleeve pipe of positioner
Wall is brought into close contact, and plug insulates the main borehole；Above carry the drilling rod, the lowering system of the positioner and the sealing base
Seat separation；
S30, transfers gyroscope, measures the true bearing angle of the guiding surface of the sealing base, calculates the true bearing angle
With the phase difference between predetermined design orientation, the gyroscope is reclaimed；
S40, reclaims whipstock, the recovery whipstock is transferred to the sealing base by the drilling rod, described in well head adjustment
Whipstock is reclaimed to lock with the sealing base；The drilling rod is above carried, the recovery whipstock is given up with the drilling rod；
S50, opens a window at the windowing inclined-plane of the recovery whipstock, sidetracking branch well；Branch well fracturing tool string is transferred to institute
State in branch well, complete branch borehole fracturing work, act the releasing tool in described sleeve pipe；
S60, the drilling rod transfers casing section mill, and the casing section mill reclaims the recovery whipstock；The drilling rod transfers junk mill milling
The plug, connects the main borehole and the branch well；
Include step S510 in the S50, in decentralization branch well fracturing tool string to the branch well, the drilling rod is transferred from upper
Upper releasing tool, lower releasing tool and the branch borehole pressure break completion tubular column connected with can be removably mounted successively under, it is described on lose
Hand-held tool includes the upper releasing running tool connected with can be removably mounted successively from top to bottom and tieback insertion tube of above giving up；Under the drilling rod
It is put into behind position, the lower releasing tool is located in the branch well；
Above carry the drilling rod, the upper releasing running tool with it is described on tieback insertion tube of giving up give up；The lower end of pressure break tubing string
Jacket pipes are connected back to, the tieback intubation inserts tieback insertion tube of being given up on described, realizes the tieback of the pressure break tubing string；It is described
Pressure break tubing string is docked with the branch borehole pressure break completion tubular column, forms airtight passage, is carried out branch borehole pressure break and is made
Industry；
Acting releasing tool in described sleeve pipe includes step S520, is suppressed in well head, the lower releasing tool with it is described
On tieback insertion tube of giving up give up, rise the pressure break tubing string, tieback intubation and it is described on give up tieback insertion tube.
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| CN104895516B (en) * | 2015-05-22 | 2017-12-15 | 姚娜 | Slim-hole sidewall coring tool |
| CN105507839A (en) | 2015-12-01 | 2016-04-20 | 中国石油天然气集团公司 | Window milling method for casings of continuous oil pipes |
| CN109899047B (en) * | 2017-12-07 | 2021-02-26 | 中国石油化工股份有限公司 | Tieback fracturing method and anchoring retrievable tieback fracturing shaft |
| CN109931042B (en) * | 2017-12-18 | 2022-03-01 | 中国石油天然气股份有限公司 | Directional hydraulic sand-blasting perforation fracturing device and method |
| CN109403943A (en) * | 2018-09-26 | 2019-03-01 | 中国石油天然气股份有限公司 | Staged fracturing method for 3-inch half sidetracking horizontal well |
| CN115637925A (en) * | 2021-07-19 | 2023-01-24 | 蓝土地能源技术有限公司 | Rigid-transmission branch drilling and completion tool and drilling method thereof |
| CN113586025B (en) * | 2021-09-03 | 2023-03-14 | 陕西延长石油（集团）有限责任公司 | Compact reservoir horizontal well intermittent volume fracturing device and method |
| CN114439454A (en) * | 2021-12-09 | 2022-05-06 | 潍坊市宇宏石油机械有限公司 | Multilateral well drilling and completion device and using method |
| CN114607318A (en) * | 2022-03-24 | 2022-06-10 | 中煤科工集团西安研究院有限公司 | Fracturing cooperative construction method for combined production and drilling of multi-layer horizontal well for deep coal bed methane |
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